Pateick gannon



(No Model.) 2 Sheets-Sheet 1. P. GANNON.

TELBPHONIG APPARATUS. No. 349,839. Patented Sept. 28,'1886.

(No Model.) 2 shee's'-sheet 2.

P. GANNON.

TELEPHONIO APPARATUS. No. 349,839. Patented Sept. 28,.1886.

NIT'ED STAT'ES PATENT OFFICE.

PATRICK GANNON, OF 107 ST. GEORGES ROAD, COUNTY OF SURREY, ENGLAND.

TELEPHONIC APPARATUS.

PECIPICATION forming part of Letters Patent No. 349,839, dated September 28, 1886.

Application filed June 7, 1836. Serial No. 204,411. (No model.) Patented in England May 1` 1886, No. 5,9110.

To aZZ whom it may conccrn:

Be it known that I, PA'rRroK GANNON, a subject of the Queen of Great Britain, and residing at 107 St. George7s Road, in the county of Surrey, England, have invented certain Improvements in Telephonic Apparatus, (for which I have obtained a patent in Great Britain, No. 5,9 i0, dated May 1, 1886,) of which the following is a specification.

The object of my invention is to provide means whereby a return-current is transmtted to the sending-station to indieate that the bell or calling` device at a distant station has been sounded or operated, applicable more especiall y in cases where a magneto-call apparatus is used.

According to my invention I provide the armature of the bell or moving part of the calling device with an arm, pendulum, or equiv' alent moving part, which, owing to the movement for Operating the bell or device, vibrates or moves so as to send a return-current back to the sendingstation to give the required indication. The said pendnlum or its equivalent may for this purpose act as an automatic switch by which contact is made and broken in the primary circuit of the induction-coil and an induced current is sent to the sendingstation, or so that a current from a battery is transmitted to the sending-station to denote that the bell has sounded or calling device been operatcd at the distant station 5 or the said pendulum may carry a coil caused to move before the poles of a magnet, so as to induce the necessary return-current; or the magnet may similarly be carried by the pendulum and be caused to move in proxilnity to a coil for the same purpose. i

I will describe, with reference to the accompanying diagram, the best means with which I am acquainted for carrying niy invcn tioninto effect.

The said diagram illustrates niy invention as applied to the operation of the pendulum as aswitch to make and break contact in a crcuit with the primary of the induction-coil to send induced currents along the line to the sending-station, when the pendulum vibrates after the bell or calling device has operated, so as to aet as an automatic switch; but it is to be understood that my invention is not limited in its application to the way shown of causing the pendulum or the like to effect the production of the return-current, nor is it limited to the form of instrument shown.

In the accompanying drawings, which form a part of this specification, Figurc I is a diagrammatic representation of one manner in which the invention may be carried into effect, and Figs. II and III are similar views illustrating solnewhat different modes of applying theprinciple of theinvention. Referring now to Fig. I-

a is the case of the tclephonc, and b is thelid or door thereof.

c are the gongs, mountcd 011 the body a, and e are the coils of the bell, these coils being situated on the lid b in the position show with the armaturef bcneath.

(Z are the magnets of the bellsounding magneto-electric generator.

(1 indicates the reeeivcr, and h the transinitter.

'i indicates thelocal battery, and j the induction-coil of the telephone.

k is the earth-plate.

Z is the tclephone-switch, and m is the line- Wire.

The ordinary conneetions for the working of the telephone are provided.

According to my invention I provide the armature f with a stem, a, prefcrably of flexible steel-spring, having thereon a contact maker and breaker or automatic switch, 1), this stem and switch-piece constitnting a pendulum. In proximity to the contact-piece p are two contact-Springs, (1 and r, fixed to conducting-brackets 8 t, affixed to the lid b. The said Springs are arranged (as shown at X in view at right angles to that shown in the diagram) so that their adjacent ends do not touch each other, but are in such a position that the contact piece or bob 1) of the pendulum will make contact with both Springs simultaneously only when the pendulum is set in motion by the ringing of the bell.

a is a wire connecting the bracket 8 with the contact-piece e of the switch, the connection being thence to one pole of the battery/i.

w is a wire connecting the bracket t to the IDG Wire leading to the other pole of the battery through the primary of the induction-coil. y

After the bell has rung the piece p by'the vibration of the pendulum of which it forms 5 the bob, makes and breaks contact between the ends of the Springs q and r, thereby closing and opening the local circuit through the primary of the induction-Geil, and inducing a current in the secondary thereof, which inro duced current passes to the line, as shown by arrows, and thence to the sending-station (that from which the callv has come) and through the receiving-instrument at that station the pulsations due to the make and break of the bob p can be heard, and so it is ascertained that the bell has rung at the called station.

There may be but one end to each of 'the springs q to be touched by the piece 10,' but I prefer to provide two ends to each for this purpose, as shown, to insure the proper action of the device.

In Figs. II and III only the lid Z) of the box and the parts connected therewith are shown. As shown in Fig. II, the rgid arm or pendu- 2 5 lum n has a flexible steel spring, n', forming a continuation thereof, and oarrying at its lower end a small electro-magnet, 11'. The coils of this magnet are included in circuit with the coils e of the bell-magnet,` as shown. The

magnet p' is suspended between the poles of a permanent horseshoe-magnet, q', there being sufficient space between the poles of the latter* topermit the vibration of the magnet p' whenever the armature f is actuated to ring the bell. The magnet q' is preferably the common form known as a compound77 magnet, composed of two or more separate magnets placed side by side. Vhenever the armature f is actuated by its magnet to ring the bell, 40 the magnet p' continues to vibrate for a short time between the poles of the permanent magnet q', whereby impulses are generated in the coils of magnet p', which impulses pass over the line and are perceptible at the calling-station. The device illustrated in Fig. III also operates to generate 01' induce impulses on the line, instead of to make and break a battery current. As shown in this figure, the electro-magnet is stationary, and the perma- '50 nent magnet is suspended from the arm or pendulum n, which in this case should be of r oscillation of said pendulum,and thereby transclosing and breakingswitch carried by said arm or pendulum and electrical circuits and connections, whereby a return-signal is transmitted to the calling-station whenever said calling or signaling device is operated, substantially as described.

2. The combination, with the armature of the bell or calling device, of an arm or pendulum' connected with and operated by said armature and means actuated by said arm or pendulum for sending a return-current when 7 said calling device is operated, substantially as described.`

3. In a telephone system, the combination, with the battery-circuit and the primary of an induction coil the secondary whereof is connected to line, of the calling device at a subscribefls station, a pendulum operated by the armature of said calling device, and a circuit adapted to be opened and closed'by the 35 mita return-signal, substantially as described.

4. In atelephone-station apparatus,the combinaton of .the bell-armature, the pendulum connected therewith, the contact-Springs, and

the local-battery circuit including the primary of an induction-coil, the secondary thereof being connected to line, substantially as described.

In testimony whereofIhave signed my name to this specification in the presence of two 95 subscribing witnesses. p

P. GANNON.

VVitnesses:

. CHAs. MILLs,

EDWD. GEO. DAvIEs, Both of 47 Lincolnls Inn Fields, London. 

